let promise = Promise.resolve('后盾人');
promise = promise.then((v) => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      console.log('ssss');
      resolve('ss');
    }, 2000);
  });
});
promise.then((v) => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      console.log('ssss');
      resolve('ss');
    }, 2000);
  });
});
